Third Wave Water TDS meter

 Oh if my reef tank friends could see me now. Never would I have thought that KNIFE would sell a TDS meter. Love it.

Check your water. Tap / cith water is filled with contaminants. This tds meter will show you the total dissolved solids in the water you are using.

I find this handy to remind me if I added a sachet of Third Wave Water or not.

Please note that this does not tell you the exact mineral content in the water - just the tds reading. Personally we've found that a reading between 110ppm - 140ppm (a little diluted) is fantastic for coffee. One third wave sachet to 1 gallon of water will yield you 160ppm - 180ppm.